MOCVD生长的II-VI族化合物固溶体组分的热力学分析.2.Hg（1-x）CdxTe体系

对MOCVD生长Hg_(1-x)Cd_xTe进行了热力学分析.所用的起始原材料为Hg、DM-Cd和R_2Te.计算结果一方面表明CdTe优先并入倾向使得在通常的DAG工艺中x值非常不易控制.另一方表明即使在Hg存在的情况下,也可以沉积几平纯的CdTe,这对实现IMP工艺非常有利,计算结果还表明II/VI比对HgCdTe的组分控制起着关键性的作用.在DAG工艺中,较低的II/VI比可以改善对x值的控制能力,LMP-DAG工艺是降低II/VI比的较好途径.还计算了生长温度和反应室压力对固相组分的影响以及LMP-DAG工艺中生长温度与HgCdTe组分对最低汞分压的影响.

U-transformation-finite element method in 3-dimensional analysis of orthotropic laminates

For an orthotropic laminate, an equivalent system with doubly cyclic periodicity is introduced. Then a 3-dimensional finite element model for the equivalent system is transformed into the unitary space, where the large finite element matrix equation is decoupled into some small matrix equations. Such a decoupling very efficiently reduces the computational effort. For an orthotropic laminate with four clamped edges, no exact elasticity solution is available, and the deflection values predicted by different methods have a considerable difference each other for a small length-to-thickness ratio. The present predictions are the largest because the present method is a full 3-dimensional finite element analysis without superfluous constraints. Illustrative numerical examples are presented to observe the distributions of stresses through the thickness of the laminates. (C) 2010 Elsevier Ltd. All rights reserved.